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Message Posted: Fri, 29 Oct 2010 @ 14:04:15 GMT

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<-- Anonymously Posted: Friday, October 29, 2010 10:01 -->

The DBC.tablesize view will show uneven data distribution for tables on your system. You may find this query useful.

     sel databasename, tablename
     , sum(currentperm) sum_perm
     , max(currentperm) as high_amp
     , max(currentperm)/sum(currentperm) *100 as PctOnHighAmp
     , (max(currentperm)*(max(vproc) +1))/ sum(currentperm) as skew_factor
     , ((max(currentperm)*(max(vproc) +1))/ sum(currentperm) /(max(vproc)+1)
     )*100 as skew_percentage
     , min(currentperm) as low_amp
     , avg(currentperm) as avg_amp
     , stddev_pop(currentperm) as stddev
     from dbc.tablesize
     group by 1,2
     having sum(currentperm) > 10000000
     order by skew_factor desc

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